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<h1 align=center style='text-align:center'>循环控制</h1>

<p class=MsoNormal><span style='font-family:宋体;color:#555555;background:white'>【例</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555;background:
white'>6.10</span><span style='font-family:宋体;color:#555555;background:white'>】用</span><span
class=apple-converted-space><sub><span lang=EN-US style='font-family:"Tahoma","sans-serif";
color:#555555;border:none windowtext 1.0pt;padding:0cm;background:white'>&nbsp;</span></sub></span><span
style='font-family:宋体;color:#555555;background:white'>公式求</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555;background:
white'>π</span><span style='font-family:宋体;color:#555555;background:white'>。</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555'><br>
<span style='background:white'>N-S</span></span><span style='font-family:宋体;
color:#555555;background:white'>流程图：</span><span lang=EN-US style='font-family:
"Tahoma","sans-serif";color:#555555'><br>
<span style='background:white'>#include&lt;math.h&gt;</span><br>
<span style='background:white'>main()</span><br>
<span style='background:white'>{</span><br>
<span style='background:white'>&nbsp; int s;</span><br>
<span style='background:white'>&nbsp; float n,t,pi;</span><br>
<span style='background:white'>&nbsp; t=1,pi=0;n=1.0;s=1;</span><br>
<span style='background:white'>&nbsp; while(fabs(t)&gt;1e-6)</span><br>
<span style='background:white'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {pi=pi+t;</span><br>
<span style='background:white'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; n=n+2;</span><br>
<span style='background:white'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; s=-s;</span><br>
<span style='background:white'>t=s/n;</span><br>
<span style='background:white'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span><br>
<span style='background:white'>&nbsp;
pi=pi*4;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><br>
<span style='background:white'>&nbsp; printf(&quot;pi=%10.6f\n&quot;,pi);</span><br>
<span style='background:white'>&nbsp; }</span><br>
<br>
<br>
</span><span style='font-family:宋体;color:#555555;background:white'>【例</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555;background:
white'>6.11</span><span style='font-family:宋体;color:#555555;background:white'>】判断</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555;background:
white'>m</span><span style='font-family:宋体;color:#555555;background:white'>是否素数。</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555'><br>
<span style='background:white'>N-S</span></span><span style='font-family:宋体;
color:#555555;background:white'>流程图：</span><span lang=EN-US style='font-family:
"Tahoma","sans-serif";color:#555555'><br>
<span style='background:white'>#include&lt;math.h&gt;</span><br>
<span style='background:white'>main()</span><br>
<span style='background:white'>{</span><br>
<span style='background:white'>int m,i,k;</span><br>
<span style='background:white'>scanf(“%d”,&amp;m);</span><br>
<span style='background:white'>k=sqrt(m);</span><br>
<span style='background:white'>for(i=2;i&lt;=k;i++)</span><br>
<span style='background:white'>if(m%i==0)break;</span><br>
<span style='background:white'>if(i&gt;=k+1)</span><br>
<span style='background:white'>printf(“%d is a prime number\n”,m);</span><br>
<span style='background:white'>else</span><br>
<span style='background:white'>printf(“%d is not a prime number\n”,m);</span><br>
<span style='background:white'>}</span><br>
<br>
</span><span style='font-family:宋体;color:#555555;background:white'>【例</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555;background:
white'>6.12</span><span style='font-family:宋体;color:#555555;background:white'>】求</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555;background:
white'>100</span><span style='font-family:宋体;color:#555555;background:white'>至</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555;background:
white'>200</span><span style='font-family:宋体;color:#555555;background:white'>间的全部素数。</span><span
lang=EN-US style='font-family:"Tahoma","sans-serif";color:#555555'><br>
<span style='background:white'>#include&lt;math.h&gt;</span><br>
<span style='background:white'>main()</span><br>
<span style='background:white'>{</span><br>
<span style='background:white'>int m,i,k,n=0;</span><br>
<span style='background:white'>for(m=101;m&lt;=200;m=m+2)</span><br>
<span style='background:white'>{</span><br>
<span style='background:white'>k=sqrt(m);</span><br>
<span style='background:white'>for(i=2;i&lt;=k;i++)</span><br>
<span style='background:white'>if(m%i==0)break;</span><br>
<span style='background:white'>if(i&gt;=k+1)</span><br>
<span style='background:white'>{printf(“%d”,m);</span><br>
<span style='background:white'>&nbsp;&nbsp; n=n+1;}</span><br>
<span style='background:white'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if(n%n==0)printf(“\n”);</span><br>
<span style='background:white'>}</span><br>
<span style='background:white'>printf(“\n”);</span><br>
<span style='background:white'>}</span></span></p>

<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>

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